Malicious PDF — malware analysis report

Static analysis result for SHA-256 6470ed2ac2c3e022…

MALICIOUS

PDF

109.0 KB Created: 2021-06-30 08:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f01e74a1f6cb3ef2665cdc5c7858d42 SHA-1: 7770463de7011f101d25909a364e81945cb61d7b SHA-256: 6470ed2ac2c3e022434d6eafc5858a5485838c0847341774d22c4f2cd33ad79c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608046bcc07b8---faxokomeponofifufided.pdf In PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/92466132090.pdfIn PDF document text
    • https://giustofiori.it/file/32669743342.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/nemenexokiwuvazibaninineb.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83a8906ab---zavukedozememuxajojapoz.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160867f58ea24b---96631649465.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/q3gukvoikbhaiv53rutvgc2f66/loratasovebirosukakow.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6rpj160jt8ssultci3gavcug4d/gojesizex.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed07a3536---kutewewa.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///67169582842.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jabiragigapofakesiluta.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/92d2a6d2ea0f803dd27983735cb4b528/66738357753.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/102931fd3a1419f95a306ba2fef6fe8e/luxokibudigerugo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c759b5fafb---86223572560.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/7318236aeec6ddf872030830936a8db6/lagerawades.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4fa64d54---rotepoxosokilo.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210614032045.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/indmitss8he0fedr5bp77d9fm4/fejubexuxexanedujipagavis.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66846a9f8b---45392302596.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/getalawuxezitira.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ai55gs3v03ghe9dufc28gftgi0/35776285461.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986b0bd1299---26480277638.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/1328434368.pdfIn PDF document text
    • http://dijitalsanat.link/upload/files/56525674078.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe2e14d53---30749653657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=medieval+total+war+strategyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C4 18616 bytes
SHA-256: 1ea7671b0a2b03c244d35dcf1f28c3eac7995d3f6495c5970af47f9a9950d549
font_01_sfnt_off0001769f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB6 10580 bytes
SHA-256: 56b03cf14f1d002718cdd4a9d41818e106b7de0c8a8bc9bfeb95e5ee3333001e